C++ (Cpp) nilfs_mdt_insert_new_blockの例

コード例 #1

ファイル: mdt.c プロジェクト: 12rafael/jellytimekernel

static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
				  struct buffer_head **out_bh,
				  void (*init_block)(struct inode *,
						     struct buffer_head *,
						     void *))
{
	struct the_nilfs *nilfs = NILFS_MDT(inode)->mi_nilfs;
	struct super_block *sb = inode->i_sb;
	struct nilfs_transaction_info ti;
	struct buffer_head *bh;
	int err;

	if (!sb) {
		/*
		 * Make sure this function is not called from any
		 * read-only context.
		 */
		if (!nilfs->ns_writer) {
			WARN_ON(1);
			err = -EROFS;
			goto out;
		}
		sb = nilfs->ns_writer->s_super;
	}

	nilfs_transaction_begin(sb, &ti, 0);

	err = -ENOMEM;
	bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0);
	if (unlikely(!bh))
		goto failed_unlock;

	err = -EEXIST;
	if (buffer_uptodate(bh))
		goto failed_bh;

	wait_on_buffer(bh);
	if (buffer_uptodate(bh))
		goto failed_bh;

	bh->b_bdev = nilfs->ns_bdev;
	err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
	if (likely(!err)) {
		get_bh(bh);
		*out_bh = bh;
	}

 failed_bh:
	unlock_page(bh->b_page);
	page_cache_release(bh->b_page);
	brelse(bh);

 failed_unlock:
	if (likely(!err))
		err = nilfs_transaction_commit(sb);
	else
		nilfs_transaction_abort(sb);
 out:
	return err;
}

コード例 #2

ファイル: mdt.c プロジェクト: Ale1ster/kerneldir

static int nilfs_mdt_create_block(struct inode *inode, unsigned long block,
				  struct buffer_head **out_bh,
				  void (*init_block)(struct inode *,
						     struct buffer_head *,
						     void *))
{
	struct super_block *sb = inode->i_sb;
	struct nilfs_transaction_info ti;
	struct buffer_head *bh;
	int err;

	nilfs_transaction_begin(sb, &ti, 0);

	err = -ENOMEM;
	bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0);
	if (unlikely(!bh))
		goto failed_unlock;

	err = -EEXIST;
	if (buffer_uptodate(bh))
		goto failed_bh;

	wait_on_buffer(bh);
	if (buffer_uptodate(bh))
		goto failed_bh;

	bh->b_bdev = sb->s_bdev;
	err = nilfs_mdt_insert_new_block(inode, block, bh, init_block);
	if (likely(!err)) {
		get_bh(bh);
		*out_bh = bh;
	}

 failed_bh:
	unlock_page(bh->b_page);
	page_cache_release(bh->b_page);
	brelse(bh);

 failed_unlock:
	if (likely(!err))
		err = nilfs_transaction_commit(sb);
	else
		nilfs_transaction_abort(sb);

	return err;
}